postgres: add more annoying prompt for postgres updates

[SuperSandro2000]

Things done

• Made sure, no settings are changed by default
• Tested changes on a real world deployment

[SuperSandro2000]

The eval failure with my branch is unrelated. I need to add something like the following to my branch:

# https://github.com/h5bp/server-configs-nginx/blob/main/h5bp/web_performance/cache-file-descriptors.conf
open_file_cache max=1000 inactive=20s;
open_file_cache_valid 30s;
open_file_cache_min_uses 2;
open_file_cache_errors on;